Phase transfer-catalysed, cobalt carbonyl-catalysed reaction of alkynes with carbon monoxide and methyl iodide affords but-2-enolides; acylation occurs if dienes instead of alkynes are used as reactants.
H. Alper, J. K. Currie and H. des Abbayes, J. Chem. Soc., Chem. Commun., 1978, 311 DOI: 10.1039/C39780000311
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